Improvement in vertical cylindrical steam-boilers



NITED STATES PATENT Orricn.

JOSEPH W. STRANGE AND ELIAS STRANGE, OF TAUNTON, MASSACHUSETTS.

Specification forming part of Letters Patent No. 34, dated September 29,1836.

To all whom, it may concern:

Be it known that we, JOSEPH IV. STRANGE and ELIAS STRANGE, of Taunton,in the county of Bristol and State of Massachusetts, have invented auImprovement in Vertical Cylindrical Steam-Boilers; and we do herebydeclare that the following is a full and exact description thereof,reference being had to the drawings which accompany and make a part ofthis specification.

lIn this boiler the furnace and ash-pit are situated in themmannercommon to vertical cylindrical boilers, and as we generally construct itwe employ three concentric cylinders,

the middle one of which constitutes the main tlue immediately above thefurnace, and between which and the second cylinder the main body of thewater to be heated is contained. The space between the second and outercylinder forms an exterior flue surrounding the boiler, and within italso are contained tubes leading from the upper to the lower part of theboiler for the circulation of water in a wayto be presently described.

Figure 1 in the accompanying drawings represents a vertical section ofthe boiler, A being the ash-pitand B the furnace. C is the vert-icalflue closed at the upper end by a cap or cover c, the communication fromthe center line C to that which surrounds 4the boiler being through aseries of tubes and runninghorizontally, or nearly so, to the spacebetween the second and exterior cylinders. These tubes are marked D D D,and the outer space into which they open is marked E E. They of courseoperate as so many flues, the heated air from the furnace passingthrough them, and iu doing so communicating its heat to the water bywhich they are surrounded.

Fig. 2 is a horizontal section of the boiler through one of the tiers ofhorizontal tubes, of which ten are represented in Fig. l.

The same letters are used in both figures to designate similar parts.

F FF, Figs. l and 2, is the water-space between the tubes. The dottedline G, Fig. 1,

is the water-line and H the steam-chamber.

The number of tubes passing horizontally may be varied; but, as shown inthe drawings, they would amount to eighty, there being eight in each ofthe ten tiers. To cause a circulation of water in the boiler, we place anumber of tubes passing vertically through the space E and opening intothe water at the upper and lower ends of the boiler. Two of these tubesare seen at I I. The number of these may vary; but we think that eightwill be sufficient. The outer wall or crust of the space E E may, ifpreferred, be built of brick or other material; or if made of sheetironit may be surrounded by brick-work or other bad conductor of heat.

Instead of placing thetubes I I in the way described, we intendsometimes to surround what in Fig'. l is the outer cylinder by a fourth,forming a space J J, Fig. 3, communicating above and below with thewater in the boiler and allowing of a free circulation thereof. Thisspace is also represented at J J, Fig.

v2. The variation in the arrangement of the parts which will be renderednecessary by the substitution of this cylindrical water-space for thetubes will be apparent to every competent engineer.

/Ve have not given any particular dimensions or scale of proportions, asthese may be changed without altering theprinciple of construction andmay be safely left to the judgment of those conversant with suchstructures.

We do not claim to be the inventors of the individual parts of thewithin described boiler, concentric cylinders, and horizontal andvertical tubes, both of the passage of `heated air and the conveyance ofwater be- .ing well known and having been frequently employed inboilers; but

What we do claim as our invention is The manner in which we havearranged and combined these cylinders and tubes, as herein set forth,constructing, as we believe, a boiler which is essentially new in itsgeneral character.

- JOSEPH /V./S' [`RANGE.

ELIAS STRANGE.

Witnesses:

A. BAssuT'r, Ons-"I, H. BAssEfrT.

